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Loans - TDR Number of Contracts Modified And Recorded Investment (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) contracts | Dec. 31, 2016 USD ($) contracts | Dec. 31, 2015 USD ($) contracts
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 426 | 405 | 424
Total Recorded Investment Modified as TDRs During Period | $ 10,125 | $ 21,258 | $ 23,324
Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 29 | 32 | 39
Total Recorded Investment Modified as TDRs During Period | $ 3,715 | $ 8,641 | $ 12,588
Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 9 | 14 | 14
Total Recorded Investment Modified as TDRs During Period | $ 1,363 | $ 6,381 | $ 4,160
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 0 | 2 | 2
Total Recorded Investment Modified as TDRs During Period |  | $ 1,143 | $ 513
Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 1 | 0 | 1
Total Recorded Investment Modified as TDRs During Period | $ 8 |  | $ 19
Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 0 | 1 | 0
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 15 | 11 | 11
Total Recorded Investment Modified as TDRs During Period | $ 630 | $ 1,122 | $ 1,185
Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 33 | 34 | 39
Total Recorded Investment Modified as TDRs During Period | $ 2,247 | $ 2,406 | $ 3,254
HELOC |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 19 | 13 | 26
Total Recorded Investment Modified as TDRs During Period | $ 576 | $ 282 | $ 360
Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 11 | 5 | 9
Total Recorded Investment Modified as TDRs During Period | $ 294 | $ 105 | $ 155
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Number of Contracts | contracts | 309 | 293 | 283
Total Recorded Investment Modified as TDRs During Period | $ 1,292 | $ 1,178 | $ 1,090
Accruing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 3,923 | 4,628 | 11,766
Accruing | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 945 | 191 | 8,948
Accruing | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 1,050 | 3,844 | 637
Accruing | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  |  | 513
Accruing | Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 0 | 0 | 19
Accruing | Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 0 | 0 | 0
Accruing | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 144 | 89 |
Accruing | Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 888 | 114 | 1,132
Accruing | HELOC |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 474 | 104 | 315
Accruing | Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 251 | 102 |
Accruing | Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 171 | 184 | 202
Nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 6,202 | 16,630 | 11,558
Nonaccrual | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 2,770 | 8,450 | 3,640
Nonaccrual | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 313 | 2,537 | 3,523
Nonaccrual | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period |  | 1,143 |
Nonaccrual | Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 8 |  |
Nonaccrual | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 486 | 1,033 | 1,185
Nonaccrual | Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 1,359 | 2,292 | 2,122
Nonaccrual | HELOC |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 102 | 178 | 45
Nonaccrual | Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | 43 | 3 | 155
Nonaccrual | Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Recorded Investment Modified as TDRs During Period | $ 1,121 | $ 994 | $ 888

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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